Plaster composition



a mixture.

Patented Nam- 19, 1929 I 1,736,294

UNITED sm'rasm'rau FREDERICK M. VENZIE, OF PHILADELPHIA, PENNSYLVANIA rnasran comrcsrrron Hie Drawing. Application filed Iune 16, 1983. Serial No. 845,717.-

This invention generall stated relates to partition, wall, ceiling an like construction and. specifically relates to a plaster composition therefor. w

6 The objects of the present invention will be apparent from the following description.

A description will first be given of my improved plaster and plaster-block composition. I take about one part of plaster-of- 10 Paris, aboutone' quarter part of asbestos powder and either powdered cork, fine sawdust or finely cut spon in the proportion of about one-half part an mix together in a dry state and then add thereto and mix therewith 15 about three-quarters part of water. If a binder is required I add a small quantity ofliquid or powdered glue. If desired I addabout 5% of silicate of soda or-a similar amount of dextrine for hardening purposes. The above composition may be used as a laster or be formed into plaster-blocks. tvis termed rough coating and I surface same' with a finishing coating made as follows :I- take about one part of plaster-of-Paris, about one-quarter part of asbestos powder and mix therewith. about three-qiiarters part of water to which mixture add a, retarder, that is an ingredient to prevent quick setting. may use Epsom-salts, boric-acid, powdered-soap or other-retarder in the 'proportion of about of 1%. Both the rough and finishing ma rial is eflicient and relatively cheap and when formed into socalledplaster-blocks form a light I structure possessed of sound-proofing, moisture proofing and fire-proofing characteristics, and also prevents check-cracking WhatIclaimis:- v a A plaster composition for'building purpgses comprising about one part of plaster 0 -Paris, about one quarter'part ofyasbestos powder; about one-halfart of sawdust; and a suflicient quantity 0 waterto procure In testimony whereof, I have hereunto signed my name.

, FREDERICK M. VENZIE. 

